dart2js: fail gracefully with invalid package config

tests/standalone/standalone.status

 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # WARNING:
 # Tests using the multitest feature where failure is expected should *also* be
 # listed in tests/lib/analyzer/analyze_tests.status without the "standalone"
 # prefix.
 
 package/invalid_uri_test: Fail, OK # CompileTimeErrors intentionally
@@ skipping 82 matching lines @@
 http_launch_test: Skip
 javascript_int_overflow_test: Skip
 javascript_int_overflow_literal_test: Skip
 oom_error_stacktrace_test: RuntimeError, OK # (OOM on JS may produce a stacktrace).
 vmservice/*: Skip # Do not run standalone vm service tests with dart2js.
 issue14236_test: Skip # dart2js does not deal with Script snapshots.
 javascript_compatibility_errors_test: Skip
 javascript_compatibility_warnings_test: Skip
 unboxed_int_converter_test: Skip
 pair_location_remapping_test: Skip
-package/scenarios/invalid/non_existent_packages_file_test: Crash # Issue 24118
-package/scenarios/invalid/invalid_utf8_test: Crash # Issue 24120
-package/scenarios/invalid/invalid_package_name_test: Crash # Issue 24121
-package/scenarios/invalid/same_package_twice_test: Crash # Issue 24122
 
 [ $compiler == dart2js && $jscl ]
 assert_test: RuntimeError, OK # Assumes unspecified fields on the AssertionError.
 deoptimization_test: RuntimeError, OK # Requires bigint.
 out_of_memory_test: RuntimeError, OK # d8 handles much larger arrays than Dart VM.
 io/arguments_test: CompileTimeError, OK # Cannot pass arguments to d8.
 
 [ $compiler == dart2js && $runtime == none ]
 io/arguments_test: Fail # DartOptions not supported by dart2js, and issue 14200.
 medium_integer_test: Pass # The test only fails at runtime, not at compilation.
@@ skipping 77 matching lines @@
 [ $compiler == dart2js && $cps_ir ]
 coverage_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/addlatexhash_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/file_error_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/file_read_encoded_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/file_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/http_client_connect_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/observatory_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 io/skipping_dart2js_compilations_test: Crash # (static Iterable<Str...  cannot handle sync*/async* functions
 priority_queue_stress_test: RuntimeError # Cannot read property 'any$1' of undefined